Are you ever at a website and it has a link to a different page and want to read it later? Usually, it opens the link in a new window in front of what you are currently reading. Frustrating I know. I have a little trick for you, but this only works with Safari. Launch the Terminal application (Applications>Utilities) and get ready to rock. You will need to type the command exactly as it is here (Note: To be a Real Mac Genius, type it) :
defaults write com.apple.Safari TargetedClicksCreateTabs -bool true
and of course if you want to undo type:
defaults write com.apple.Safari TargetedClicksCreateTabs -bool false